Technorati announced tagging just two years ago! I found it hard to believe that tagging is only two years old. But on the web, I guess two is much longer than I think.

“Tags are a simple, yet powerful, social software innovation. Today millions of people are freely and openly assigning metadata to content and conversations. Unlike rigid taxonomy schemes that people dislike, the ease of tagging for personal organization with social incentives leads to a rich and discoverable folksonomy. Intelligence is provided by real people from the bottom-up to aid social discovery. And with the right tag search and navigation, folksonomy outperforms more structured approches to classification”
– Technorati’s Tag Announcement two years ago.